<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //整形 :integer 浮点数 :float
        let score = '98.5';
        // 1.字符串转化为number
        socre = parseFloat(score);
        // score = parseInt(score);
        console.log(score);
        console.log(typeof score);
        // 2.not a number
         score = parseInt('李白');
         console.log(typeof score);
        // 3,强制转化为number
        let age =Number('2342');
        console.log(typeof age);
    </script>
</body>
</html>